Master Lock 487 Rotating Electrical Plug Lockout Device accepts cords with up to 3/4″ (19mm) diameter and an electrical plug up to 2-1/4″ (57mm) diameter x 3-1/4″ (82mm). • Device surrounds the electrical plug to protect against accidental reconnection. • Rotating design allows for easier installation in confined space applications. • The tough, lightweight Zenex Thermoplastic body withstands chemicals and performs effectively in extreme conditions. • Includes high visibility permanent safety labels in English, French and Spanish. • For 120 volt plugs and many 240 volt plugs